20981258 has 8 divisors (see below), whose sum is σ = 32239620. Its totient is φ = 10234720.

The previous prime is 20981249. The next prime is 20981273. The reversal of 20981258 is 85218902.

It can be written as a sum of positive squares in 2 ways, for example, as 19509889 + 1471369 = 4417^2 + 1213^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127853 + ... + 128016.

Almost surely, 2^20981258 is an apocalyptic number.

20981258 is a deficient number, since it is larger than the sum of its proper divisors (11258362).

20981258 is a wasteful number, since it uses less digits than its factorization.

20981258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255912.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 20981258 is about 4580.5303186422. The cubic root of 20981258 is about 275.8103174045.

The spelling of 20981258 in words is "twenty million, nine hundred eighty-one thousand, two hundred fifty-eight".